Resilient suspension device for the carriage escapement mechanism of typewriting and like machines



G. PREZIOSO DEVICE FOR T MECHANISM OF TYPE May 8, 1951 f 2,552,295

RESILIENT SUSPENSION HE CARRIAGE ESCAPENENT i WRITING AND LIKE MACHINES Filed Jan. 14, 1948 nu nw. v e a 2/ und .$50, a In? u m n m m N Patented May 8, 1951 CARRIAGE ESCAPEMENT' OF l'IYFEVVRI'IING AND LIKE MACHINES Giuseppe Prezioso, Yverdon,

Switzerland, as-

signor to Paillard S. A. Sainte-'Croix a corporation of Switzerland Application January 14, 1948, Serial'No. 2,236 In Switzerland July 31, 1947 3 Claims. 1

The present invention has for its subject a device for suspending resiliently the carriage escapement mechanism of an olce machine, such as a typewriter, a calculating or other machine, wherein a carriage moves transversely on the machine under the action of an escapement mechanism in accordance with the striking of the keys.

In these machines the carriage in question is subjected to the action of a spring for producing its movement from the beginning to the end of a line of typing.

The movement of the carriage, particularly when the latter is of predetermined mass, is one of the causes of numerous disadvantages of which the principal ones are noise, vibrations and irregularities in typing.

For reducing these disadvantages it has been suggested to suspend some of the escapement members resiliently or to secure the escapement mechanism to the framework of the machine, by causing it to rest, for example, on a rubber plate so that, in both cases, the group of escapement members can oscillate freely under the shocks received, during each passage of the carriage from one tooth to the other of the escapement wheel.

However, these means have not enabled the irregularities in typing to be eliminated at a predetermined speed or under predetermined conditions of instability of the table supporting the machine.

It has also been suggested to secure the escapement members on the stationary part of the car-x riage by means of shock-absorbing springs or to mount the escapement members on this stationary part and to connect it to the framework of the machine by means of shock-absorbing springs. However, these devices result in delicate and expensive constructions.

The device which forms the subject of the present invention has for its object to remedy these disadvantages by the fact that the group of escapement members is secured rigidly to a support, the latter being connected to the framework of the machine by at least two spring blades forming part of the framework.

One form of construction of the subject of the invention is shown by the way of example in the accompanying drawing, wherein:

Fig. 1 is an elevation in which, for greater clearness the carriage and the rail by which it is supported, are not shown.

Fig. 2 is a side view.

Referring to the drawing, the framework of the machine is formed by two side walls I of sheet steel, connected rigidly together by cross bars 2 and II (Fig. 2) The escapement mechanism is mounted rigidly on a support 3. It comprises a bar 4, a pawl 5, a pawl spring 6, an escapement wheel 'l and a pinion 8, gearing with a rack 9 of the carriage I which moves on a rail II secured to the framework of the machine.

The bar il is actuated, as usual, by a pull rod I2 on which the universal bar of the machine acts on each actuation of a key.

lThe portion of the walls I, to which the support 3 is secured, is formed by two tongues I3 cut in these walls. The support 3 is secured to the free end of these tongues by means of screws I4. Each of the tongues I3 forms a spring blade.

Underneath these securing points, the support 3 is provided at each of its two ends with an arm I5, of which the extreme face is located at a short distance I5 from the inner face of the tongues I 3, that is to say from the framework.

This slight clearance I6 allows of an oscillation of the tongues I3, which is limited by the arms I5 coming into contact with the walls I.

It will be understood that the construction described may be modified in its details. Thus the support 3 may be secured at its ends to a single tongue I3 or to more than two tongues.

The tongues I3 may also be formed by separate elements secured to the framework of the machine.

It will be understood without further explanation that at each shock of a tooth of the escapement wheel 'I on the parts @i and 5 of that escapement, the support 3 which carries the parts thereof can oscillate longitudinally by a maximum amount corresponding with the distance separating the extreme face of the arms I5 from the inner face of the walls I.

I claim:

l. The combination comprising two end plates, a pair of cross bars located between said end plates and connecting together said end plates, spring blades formed integrally with said end plates, a support secured at opposite ends to the free upper ends of said spring blades, a pair of depending arms extending downwardly one from each end of said support, said arms being located at a short distance from said spring blades, said arms by contacting with said end plates serving to limit the oscillation of said spring blades, and a carriage escapement mechanism mounted on said support.

2. A device for the suspension of the escapement mechanism of the carriage of typewriting and like machines, comprising, a framework, at least two spring blades integral with the frame- 3 l work, a support connected at opposite ends to the blades adjacent the free ends thereof, a carriage eseapernent mechanism supported by the support, and stop means on the support for limiting the oscillatory movement of the blades and comprising at least a pair of arms at least one of which is rigid with each end of the support and each engaging the framework below the connection between a blade and support end.

3. A device for the suspension of the escapement mechanism of the carriage of typewriting and like machines, comprising, a frame Work, at least two spring blades each connected with one of the opposite ends of the framework, a support connected at opposite ends to the blades adjacent the free ends thereof, a carriage escapement mechanism supported by the support, and stop means on the support for limiting the oscillatory movement of the blades and comprising at least a pair of arms at least one of which is rigid with each end of the support and each engaging the framework below the connection between a blade and support end.

GIUSEPPE PREZIOSO.

REFERENCES CITED The following references are of record in the 10 file of this patent:

UNITED STATES PATENTS 

